Tech article by BwoncoHowie
The purpose of this article is to explain and cover some basic info about do it yourself C-4 Valve body service. The actual valve body is from a 1974 Bronco, therefore the illustrations may differ slightly from what you may be working on.  If you are inexperienced as a mechanic, perhaps you [...]

Tech article by Jon Hanna (Admin)
This is the second article in a two part series on popular transmission swaps into your early Bronco. The first article focused on several manual choices for those who like to row their own gears. This second article is for you folks who prefer the ease and drivability of an [...]

Tech article by Jon Hanna (Admin)

Automatic Trans Intro
• Gear Ratio Chart
• C4
• C6
• AOD
• AODE & 4R70W
• 700R4
See also Manual Trans

Tech article by Jon Hanna (Admin)

Automatic Trans Intro
• Gear Ratio Chart
• C4
• C6
• AOD
• AODE & 4R70W
• 700R4
See also Manual Trans

Tech article by Jon Hanna (Admin)

Automatic Trans Intro
• Gear Ratio Chart
• C4
• C6
• AOD
• AODE & 4R70W
• 700R4
See also Manual Trans

Tech article by Jon Hanna (Admin)

Automatic Trans Intro
• Gear Ratio Chart
• C4
• C6
• AOD
• AODE & 4R70W
• 700R4
See also Manual Trans

Tech article by Jon Hanna (Admin)

Automatic Trans Intro
• Gear Ratio Chart
• C4
• C6
• AOD
• AODE & 4R70W
• 700R4
See also Manual Trans

Tech article by Aaron Modlin (BUCKETOBOLTS)
I snapped a few PICs as I’ve been working on my C4 rebuild and thought I’d share how I modified my transmission. Most early Bronco and truck application transmissions are already well equipped. The input shafts are usually hardened. They have the “H” servo and five forward clutches. They are [...]

Tech article by Tim Bowsher (Broncobowsher)
Selecting a new transmission.
It started with when I got the latest Bronco. I didn’t want the old 3 speed anymore. I have heard about the NP435, so I got one. I ran along happily with 33’s, 4.10’s, and the NP435 behind the warmed up 351. It worked ok. The [...]